diff --git a/Calculate.java b/Calculate.java
index a533e29..50987ab 100644
--- a/Calculate.java
+++ b/Calculate.java
@@ -15,4 +15,8 @@ public double mult(double x, double y) {
 	public double div(double x, double y) {
 		return x / y;
 	}
+	
+	public int calcFact(int fact){
+		return fact == 0 ? 1 : fact*calcFact(fact-1);
+	}
 }